The usually subdued ACE Awards erupted into a dance party when rapper Flo-Rida performed shirtless and got the well-heeled guests dancing. Rida rocked the Accessories Council fete at Cipriani 42nd Street on Monday night. Guests included Nicole Richie , Diane Von Furstenberg, supermodel Agyness Deyn, and Christian Louboutin, who gave Time’s Kate Betts the Marylou Luther Award. The shoe king poked fun at Betts’ “interesting” French accent, but slipped up and called her honor the Martin Luther King Award. Also honored were hat designer Philip Treacy, and Marie Claire Editor-in-Chief Joanna Coles. [Page Six]